990984637 has 4 divisors (see below), whose sum is σ = 1015155036. Its totient is φ = 966814240.

The previous prime is 990984569. The next prime is 990984661. The reversal of 990984637 is 736489099.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 321520761 + 669463876 = 17931^2 + 25874^2 .

It is a cyclic number.

It is not a de Polignac number, because 990984637 - 2¹¹ = 990982589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990984437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12085138 + ... + 12085219.

It is an arithmetic number, because the mean of its divisors is an integer number (253788759).

Almost surely, 2^990984637 is an apocalyptic number.

It is an amenable number.

990984637 is a deficient number, since it is larger than the sum of its proper divisors (24170399).

990984637 is a wasteful number, since it uses less digits than its factorization.

990984637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24170398.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 990984637 is about 31479.9084655594. The cubic root of 990984637 is about 996.9858027433.

The spelling of 990984637 in words is "nine hundred ninety million, nine hundred eighty-four thousand, six hundred thirty-seven".